Kelly Osbourne, her boyfriend Matthew Mosshart, her brother Jack and her seven-month-old niece Pearl hung out in the water at their Hawaii hotel Saturday, one day before Jack's nuptials to Lisa Stelly. (A rep for Ozzy and Sharon's son confirmed to Us Weekly Monday that the former reality star had indeed tied the knot over the weekend.)

Clad in a strappy, neon green two-piece, Kelly, 27, showed off her slim bikini body as she swam alongside her loved ones.

The Fashion Police host first debuted her incredible, 65-pound weight loss after her 2009 Dancing With the Stars stint. Though she's managed to keep the weight off ever since, as she admitted to Glamour earlier this year, Osbourne won't ever think of herself as a "skinny" girl.

"I call myself a FFP: former fat person," Osbourne explained back in April. "And when you're an FFP, you will always see in yourself what people used to bully you for."